KR101922688B1

KR101922688B1 - Dc induction heating apparatus capable of rotating the supercondcting magnet

Info

Publication number: KR101922688B1
Application number: KR1020170022517A
Authority: KR
Inventors: 조상호; 박민원; 최종호
Original assignee: 수퍼코일 (주)
Priority date: 2017-02-20
Filing date: 2017-02-20
Publication date: 2018-11-27
Also published as: WO2018151422A1; KR20180096175A

Abstract

The present invention relates to a superconducting magnet rotating DC induction heating apparatus, and more particularly, to a superconducting magnet rotating DC induction heating apparatus which includes a pair of superconducting magnets which are positioned symmetrically with respect to a heating target product and rotate to generate a magnetic field to heat the heating target product. A pair of rotatable iron cores positioned symmetrically with respect to the heating target product positioned between the superconducting magnets and partly passing through the cutouts of the superconducting magnets; A fixing unit for fixing the object to be heated; And a rotation driving unit for rotating the superconducting magnet.

Description

TECHNICAL FIELD [0001] The present invention relates to a superconducting magnet rotating induction heating apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC induction heating type DC induction heating apparatus, and more particularly, to a superconducting magnet rotation type DC induction heating apparatus for heating a heating target product by rotating a superconducting magnet irrespective of the shape of a metal.

A superconductor is an element whose electrical resistance becomes '0' at a cryogenic temperature. It has already been used in a variety of applications because it offers advantages of high magnetic field, low loss, and miniaturization compared to conventional copper (cu) conductors.

Superconducting magnets are magnets made from these superconductors. Superconducting magnets are used in MRI, NMR, particle accelerators, and magnetic separators to improve efficiency and performance. In addition, application technology is continuously being studied throughout the industry such as power cable, superconducting transformer, and superconducting motor. It is applied to the steel industry as one of the application fields. In the steel industry, research and development of large-capacity induction heating devices is active.

Heating methods for induction heating devices can be divided into alternating current (AC) induction heating and direct current (DC) induction heating.

AC induction heating is a method of applying an alternating current to a copper magnet to generate a time-varying magnetic field. However, since AC induction heating uses copper magnets, the total energy efficiency of the system is only about 50 to 60% due to the heat generated by the resistance of the copper magnets. Therefore, superconducting magnets are used instead of copper magnets. This is to improve energy conversion efficiency.

However, the superconducting wire, which normally becomes the material of the superconducting magnet, has a disadvantage in that magnetization loss occurs in the presence of an AC current. This means that cooling is necessary to maintain the superconducting state in a cryogenic operating environment, and thus there is a problem in that the operation cost is increased together with the facility cost of the cooling device.

On the other hand, direct current induction heating is a method in which a direct current is applied to a superconducting magnet to generate a uniform magnetic field and the product is forcedly rotated by the motor in the magnetic field. This direct current induction heating has an advantage that a total system efficiency of the induction heating apparatus can be improved by 90% or more without causing heat loss of the superconducting magnet by using a direct current. In addition, since the energy is transmitted in proportion to the square of the magnetic field generated in the superconducting magnet, the heating time for the product to be heated can be shortened and the productivity can be further improved.

As a result, a DC induction heating system has been widely used as an induction heating apparatus, and a superconducting magnet for a DC induction heating system has been widely used as a racetrack type superconducting magnet.

The superconducting wire used as the material of this superconducting magnet is very expensive. Therefore, there is an increasing demand for induction heating devices that can provide the desired capacity even under the same conditions with fewer superconducting wires.

Therefore, a DC induction heating apparatus capable of heating the object to be heated regardless of the external shape and size of the object to be heated is proposed.

Korean Registered Patent No. 10-1468312 (Nov. 26, 2014) Korean Registered Patent No. 10-1658727 (Dec. 12, 2016)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a superconducting magnet rotating DC induction heating apparatus capable of providing a desired capacity even if fewer superconducting wires are used.

The present invention also provides a superconducting magnet rotating type direct current induction heating device capable of heating a product to be heated regardless of the external shape and size of the product to be heated.

The present invention also provides a superconducting magnet rotating type direct current induction heating device which can be used in various industrial fields such as extrusion and forging by heating a product to be heated regardless of the external shape and size of the product to be heated.

A superconducting magnet rotating DC induction heating apparatus according to the present invention comprises a pair of superconducting magnets which are positioned symmetrically with respect to a heating target product and rotate to generate a magnetic field to heat the heating target product; A pair of rotatable iron cores positioned symmetrically with respect to the heating target product positioned between the superconducting magnets and partly passing through the cutouts of the superconducting magnets; A fixing unit for fixing the object to be heated; And a rotation driving unit for rotating the superconducting magnet.

According to the present invention, it is possible to provide a desired capacity even if fewer superconducting wires are used.

Further, according to the present invention, the object to be heated can be heated regardless of the external shape and size of the object to be heated.

Further, the present invention can be applied to various industrial fields such as extrusion and forging by heating the object to be heated regardless of the external shape and size of the object to be heated.

1 is a plan view showing a conventional direct current induction heating apparatus,
2 is a schematic view showing a cross section of a direct current induction heating apparatus according to the present invention,
FIG. 3A is a diagram showing a configuration of a direct current induction heating apparatus according to the present invention as viewed from the front;
FIG. 3B is a view showing a configuration viewed from the side of the direct current induction heating apparatus according to the embodiment of the present invention,
4 is a view showing a first embodiment to which a DC induction heating apparatus according to the present invention is applied,
5 is a view showing a second embodiment to which a DC induction heating apparatus according to the present invention is applied.

It is noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be construed in a sense generally understood by a person having ordinary skill in the art to which the present invention belongs, unless otherwise defined in the present invention, Should not be construed to mean, or be interpreted in an excessively reduced sense. In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms can be understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Furthermore, the singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "comprising" or "comprising" and the like should not be construed as encompassing various elements or various steps of the invention, Or may further include additional components or steps.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to the same or similar elements, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

1 is a plan view showing a conventional direct current induction heating apparatus. Here, the direct current induction heating apparatus 100 rotates a heating target product 120, which is a metal product to be heated in a uniform magnetic field, and heats it to a desired temperature.

The conventional DC induction heating apparatus 100 includes a pair of superconducting magnets 110 and 110 ', a pair of movable iron cores 130 and 130', and a pair of cryogenic cooling units 140 and 140 ' And the object to be heated 120 is configured to be positioned with a distance d between the pair of superconducting magnets 110 and 110 '.

That is, the first superconducting magnet 110, the first movable iron core 130, and the first cryogenic cooling section 140 are provided on one side of the object to be heated 120, and the second superconducting magnet 110 ', A second movable iron core 130', and a second cryogenic cooling unit 140 '.

Here, the object to be heated 120 is connected to the motor shaft of the motor 150, and the object to be heated 120 is rotated in a uniform magnetic field at a constant speed by driving the motor 150, Let it heat up to the temperature.

The DC induction heating apparatus according to the present invention is a superconducting magnet rotation type DC induction heating apparatus which heats a target object by rotating a superconducting magnet in a state where a target object is fixed, . Hereinafter, the present invention will be described in detail with reference to examples and drawings. For convenience of explanation, the DC induction heating apparatus of the superconducting magnet is referred to as a DC induction heating apparatus.

2 is a schematic view showing a cross section of a direct current induction heating apparatus according to the present invention.

2, the DC induction heating apparatus 200 includes a pair of superconducting magnets 210 and 210 ', a heating object product 220, a pair of rotating iron cores 230 and 230', and a cryogenic cooling unit 240).

First, the pair of superconducting magnets 210 and 210 'rotate and generate a magnetic field to heat the object to be heated. The first superconducting magnet 210 and the second superconducting magnet 210 'are positioned to have a constant spacing distance. Here, the shape of the superconducting magnet 210 is a race track shape as an example, but the present invention is not limited thereto.

The object 220 to be heated is positioned between the first superconducting magnet 210 and the second superconducting magnet 210 '. The object 220 to be heated may be aluminum, copper, or the like as a non-magnetic material. At this time, the shape of the object 220 to be heated is cylindrical, but is not limited thereto.

The pair of rotating iron cores 230 and 230 'are positioned symmetrically with respect to each other about the object 220 to be heated. For example, the first rotary iron core 230 may be positioned on the first superconducting magnet 210 side, and the second rotary iron core 230 'may be positioned on the second superconducting magnet 210' side. At this time, a part of the first electromagnet 230 and the second electromagnet 230 'pass through the cutouts (not shown) of the first superconducting magnet 210 and the second superconducting magnet 210' .

A pair of superconducting magnets 210 and 210 'are located inside the cryogenic cooling unit 240 and a cryogenic refrigerator or a coolant is used to maintain the superconducting properties of the pair of superconducting magnets 210 and 210' Cryogenic environment is maintained. At this time, the inside is kept in a vacuum to prevent external heat penetration. Also, the cryogenic cooling section 240 is designed to be rotatable and rotated together with the pair of superconducting magnets 210 and 210 '.

FIG. 3A is a front view of the direct current induction heating apparatus according to the present invention, and FIG. 3B is a view illustrating a direct current induction heating apparatus according to the present invention.

The first superconducting magnet 310 and the second superconducting magnet 310 'are located inside the cryogenic cooling section 350 and the center of the first superconducting magnet 310 and the second superconducting magnet 310' (Not shown).

Portions of the first inner rotating iron core 330 and the second inner rotating iron core 330 'pass through the cutouts (not shown) of the first superconducting magnet 310 and the second superconducting magnet 310' . At this time, the first internal rotation type iron core 330 and the second internal rotation type iron core 330 'are provided to be symmetrical to each other on the inner peripheral surface of the external rotation type iron core 340.

The first superconducting magnet 310, the second superconducting magnet 310 ', the first inner rotating iron core 330, the second inner rotating iron core 330' and the outer rotating iron core 340 rotate simultaneously , The induction current is generated in the heating target product 320 by the rotating magnetic flux, and the heating target product 320 is heated.

Here, the cryogenic cooler 350 uses a cryocooler or a coolant to maintain a cryogenic environment even when rotating, and the inside of the cryogenic cooler 350 is kept in a vacuum state to prevent external heat penetration.

On the other hand, the object 320 to be heated is fixed by a fixing portion (not shown).

Hereinafter, two embodiments in which the DC induction heating apparatus according to the present invention is applied will be described with reference to FIGS. 4 and 5. FIG. At this time, the elements that are the same as those in the above-described drawings will not be described.

FIG. 4 is a view showing a first embodiment to which the DC induction heating apparatus according to the present invention is applied, in which the DC induction heating apparatus is rotated by a motor.

The DC induction heating device and the motor 420 are coupled by a coupling 410 and are connected to each other by a first superconducting magnet 310, a second superconducting magnet 310 ', a first internal rotating iron core 310' The second internal rotation type iron core 330 ', and the external rotation type iron core 340 are rotated by the motor 420. The rotational speed is determined by the driving speed of the motor, and the intensity of the magnetic field is controlled to obtain the target rotational torque.

5 is a view showing a second embodiment to which a DC induction heating apparatus according to the present invention is applied, in which the DC induction heating apparatus is rotated by an armature coil which generates a rotating magnetic field outside without a motor.

Specifically, the armature housing 510 is configured to surround the outside of the DC induction heating apparatus, and a plurality of armature iron cores 520 are provided on the inner circumferential surface of the armature housing 510 at regular intervals. At this time, the armature coils 530 are wound on the plurality of armature cores 520, respectively.

If a current in the same direction is flowed on each of the opposing surfaces of the armature coil 530, the opposite two phases with opposite winding directions will have opposite poles. Then, the superconducting magnets 210 and 210 'having the N and S poles are rotated to face the two poles. At this time, if a current is sequentially supplied to the other opposing pole of the armature coil 530, the object to be heated 220 which is fixed to the center while the superconducting magnet rotates is heated.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong.

Therefore, it should be understood that the present invention is not limited to these combinations and modifications. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

100: DC induction heating device
110: first superconducting magnet
110 ': second superconducting magnet
120: Products to be heated
130: First movable iron core
130 ': second movable iron core
140: first cryogenic cooling section
140 ': first cryogenic cooling section
150: motor
200: DC induction heating device
210: first superconducting magnet
210 ': second superconducting magnet
220: Products to be heated
230: 1st round iron core
230 ': second round iron core
240: Cryogenic cooling section
310: first superconducting magnet
310 ': second superconducting magnet
320: Products to be heated
330: first inner rotating iron core
330 ': a second inner rotating iron core
340: External rotating iron core
350: Cryogenic cooling section
410: Coupling
420: motor
510: Armature enclosure
520: Armature iron core
530: armature coil

Claims

A pair of superconducting magnets each having a race track shape, each of which is positioned symmetrically with respect to the object to be heated and rotated to generate a magnetic field to heat the object to be heated.
A pair of rotatable iron cores positioned symmetrically with respect to the heating target product positioned between the superconducting magnets and partly passing through the cutouts of the superconducting magnets;
An outer rotating iron core surrounding the pair of superconducting magnets and the pair of rotatable iron cores;
A fixing unit for fixing the object to be heated; And
And a rotation driving unit for simultaneously rotating the pair of superconducting magnets, the pair of rotary type iron cores, and the external rotation type iron core.

delete

The method according to claim 1,
The pair of rotary type iron cores,
Wherein the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the circumferentially-

The method according to claim 1,
The superconducting magnet includes:
Wherein the superconducting magnet is positioned inside a cryogenic cooling section for maintaining a cryogenic environment using a cryogenic freezer or a refrigerant.

5. The method of claim 4,
The cryogenic cooling unit includes:
And the inside of the superconducting magnet is held in a vacuum state.

6. The method of claim 5,
The cryogenic cooling unit includes:
Wherein the superconducting magnet is rotated by the rotation driving unit together with the superconducting magnet.

The method according to claim 1,
The rotation drive unit includes:
Wherein the superconducting magnet is rotated by a motor.

8. The method of claim 7,
The rotation drive unit includes:
And controls the rotation speed of the superconducting magnet by adjusting a driving speed of the motor.

The method according to claim 1,
The rotation drive unit includes:
Wherein the superconducting magnet is rotated using a rotating magnetic field generated by an armature coil.

10. The method of claim 9,
The rotation drive unit includes:
Armature enclosure;
A plurality of armature iron cores provided at predetermined intervals on the inner circumferential surface of the armor housing; And
And an armature coil wound around each of the plurality of armature iron cores.